GridView 记录总数（数据源：ObjectDataSource）

protected void odsGv_Selected(object sender, ObjectDataSourceStatusEventArgs e)
    {
       
        int rowCount = 0;
        DataTable dt = new DataTable();
        dt = (DataTable)e.ReturnValue;
        if (dt != null)
        {
            rowCount = dt.Rows.Count;
        }

        lbMessage.Text = "共查到" + rowCount.ToString() + "条记录";

    }